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Forum Index : Microcontroller and PC projects : PicoMite VGa PCB Release version
| Author | Message | ||||
| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 10180 |
No faults    PicoMiteVGA.zip ZIP contains a ZIP with the gerbers ready to send to JLC Bill of materials, DesignSpark design files and printable schematic NB: lots of bits on the PCB are optional depending on use - see BOM for details Edited 2022-01-11 23:18 by matherp |
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Plasmamac Guru Joined: 31/01/2019 Location: GermanyPosts: 573 |
Thanks for your work . Mfg Plasma |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7815 |
Very nice board, Peter. :) My mini version is currently partially back to design stage to make sure that it fits both variations of the 90x70x28 box that I have. It would be a pity to make it specific to one box, especially as you don't know which version will turn up! Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10180 |
Minor tweak to better centre the cut-out for the box PicoMiteVGA.zip Edited 2022-01-15 21:27 by matherp |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4298 |
Hi Peter, A couple of questions on the BOM if I may: For the SD card does R42 2R2 resistor really need to be 1% metal-film ? I already have the same value in 5% carbon-film. I have generally bought the carbon-film for hobbyist dicking about because I can read the colours easier. For the Audio C25 and C26 I have 47 nf in a different (coloured) package, white and looking most like this https://www.ebay.co.uk/itm/142777705141 but with the marking "47n J100", are these any good to me - I've no idea where they came from. Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7815 |
The type of resistor for the 2R2 doesn't matter. Your capacitors will be fine too. None of these components are doing a precision job. It's nice (but not critical) if they will fit in the space though. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4298 |
Peter, I'm not certain from the photo, but am I correct that the SD card breakout board is not attached to the PCB by a detachable pair of male and female 9 pin headers but instead it's permanently soldered to the board using just the male header ? Best wishes, Tom Edited 2022-02-04 00:34 by thwill MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7815 |
I'm not sure either, but soldering in the way you describe would certainly be more robust than using a female header. It's how I intend to mount SD card holders on my boards. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 576 |
I already ordered one last week in China, but still waiting to arrive. Why are three RaspberryPi Pico header in parallel? |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2579 |
Peter added the two extra sets of pins so future internal modules could access any Pico pins. Making them the same footprint as the Pico means those modules could also be attached to a bare Pico. |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 576 |
Thank you for the info phil! Great idea. |
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